A drawing in response to this
http://miss-froggy.deviantart.com/art/65-Horror-133907837
shows the boy's reaction to the girl's random hair change.
Kai didn't mean to say it quite like that, but it's Kai. He just says before he thinks. His people skills aren't there at all. Brackets there because he's speaking a different language.

Lyon on the other hand is trying to be supportive of Michiko's new look, despite his preference for her with long hair.